Use \n for backreferences, where "n" is a single digit. is a string to replace the regex match.is a Java regular expression, which can include capturing groups. The syntax for using sed to replace (s) text in your data is: "s///" When using the rex function in sed mode, you have two options: replace (s) or character substitution (y). Unlike Splunk Enterprise, regular expressions used in the are Java regular expressions. This section contains additional usage information about the Rex function. For example, if the rex expression is (?.), this matches the first ten characters of the field, and the offset_field contents is 0-9. The value of the field has the endpoints of the match in terms of zero-offset characters into the matched field. If you wanted to use a reserved keyword as a field name, you need to enclose that field name with single quotes, for example: offset_field='offset'. It is safer to use single quotes to avoid conflicts with reserved keywords in SPL such as offset. You can specify it either without quotes or with single quotes, such as offset_field=myfield or offset_field='myfield'. Example in Canvas View: 10 offset_field Syntax: string Description: The desired output field name. If greater than 1, the resulting fields are multivalued fields. Example in Canvas View: sed max_match Syntax: int Description: Controls the number of times the regular expression is matched. Specify to indicate that you are using a sed expression. Example in Canvas View: /.*/ Optional arguments mode Syntax: string Description: Only required when you want to use a sed (UNIX stream editor) expression. If you are using a sed expression, you must set mode=sed. Capturing groups can only contain alphanumeric characters. If a match cannot be found, the new field is still added to your records but the value is set to null. You must include a named capturing group in a regular expression pattern surrounded by forward slashes ( / ). Example in Canvas View: body pattern Syntax: regex string Description: The Java regular expression (regex) or sed expression that defines the information to match and extract from the specified field. Required arguments field Syntax: field= Description: The field that you want to extract information from. You must specify either or mode=sed when you use the rex function. Function Output collection> This function outputs the same collection of records but with a different schema S. This sed-syntax can also be used to mask sensitive data.įor more information about regular expressions in the, see about regular expressions.įunction Input/Output Schema Function Input collection> This function takes in collections of records with schema R. When mode=sed, the given sed expression used to replace or substitute characters is applied to the value of the chosen field. The rex function matches the value of the specified field against the unanchored regular expression and extracts the named groups into fields of the corresponding names. Įxtract or rename fields using regular expression named capture groups, or edit fields using a sed expression. This topic describes how to use the function in the.
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